-63.88% is the change from 850 to 307
Calculation steps:
[( 307 - 850 ) ÷ 850] x 100 = -63.88%
Formula
Percentage change = [(307 - 850) / 850] x 100
Subtract the new number by the original number
307 - 850 = -543
-543 ÷ 850 = -0.6388235294117647
-0.6388235294117647 x 100 = -63.88%